CitiBank
Credit Cards - Choose from a range of features and rewards,
including cash back, airline miles, and more.

Diner's Club Charge Card - Up to
20% savings at thousands of participating restaurants. Up to 12,000
Bonus Miles on any major US airline. Club Rewards program to turn
points from purchases into miles, merchandise and more.

Sam's Club - They issue their own
store credit card, and also two Discover cards with rewards programs.

Points.Com - Manage all of your
rewards and points programs in one place. Earn more frequent flyer
miles and rewards in your existing programs, and join new programs. Buy
mile or points, and swap them between programs. Use your miles or
points to get gift certificates for hundreds of merchants. Share your
miles or points with friends or family. Get free miles and points just
for joining (for free.)

Rewards Network - Offers discounts
at restaurants and hotels. For some reason, membership registration
involves specifying a particular credit card to be used for purchases